UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post - Cassette deck head alignment

knobtwiddler · 29th Dec 2022, 8:06 pm

I was surprised to find that on the Nakamichi CR-70 (CR-7 Japan version), the recording level trim pots roll off HF when at low rotation... I can only conclude that the designers felt it'd be fed with a 150-300mV level, and no one would put the default 1VRMS from their analyser into FR (as I did, when I got the machine to test head FR). It seems that they made a trade-off against fitting an extra buffer VS the amount of people likely to feed it with a 1V signal. Mind you, some CD players can give 2VRMS @ 0dBFS, and the CR-70 was made up until 1992...which makes me suspect that a few users might have tapes with somewhat rolled off HF...

29th Dec 2022, 8:06 pm	#16
knobtwiddler Octode Join Date: Mar 2016 Location: London, UK. Posts: 1,050	Re: Cassette deck head alignment - a surprise I was surprised to find that on the Nakamichi CR-70 (CR-7 Japan version), the recording level trim pots roll off HF when at low rotation... I can only conclude that the designers felt it'd be fed with a 150-300mV level, and no one would put the default 1VRMS from their analyser into FR (as I did, when I got the machine to test head FR). It seems that they made a trade-off against fitting an extra buffer VS the amount of people likely to feed it with a 1V signal. Mind you, some CD players can give 2VRMS @ 0dBFS, and the CR-70 was made up until 1992...which makes me suspect that a few users might have tapes with somewhat rolled off HF...